Modifies AudioInputCallback::OnData and use media::AudioBus instead of plain byte vector (Relanding)

media/audio/audio_io.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef MEDIA_AUDIO_AUDIO_IO_H_
 #define MEDIA_AUDIO_AUDIO_IO_H_
 
 #include "base/basictypes.h"
 #include "media/audio/audio_buffers_state.h"
 #include "media/base/audio_bus.h"
@@ skipping 91 matching lines @@
 };
 
 // Models an audio sink receiving recorded audio from the audio driver.
 class MEDIA_EXPORT AudioInputStream {
  public:
   class MEDIA_EXPORT AudioInputCallback {
    public:
     // Called by the audio recorder when a full packet of audio data is
     // available. This is called from a special audio thread and the
     // implementation should return as soon as possible.
-    virtual void OnData(AudioInputStream* stream, const uint8* src,
-                        uint32 size, uint32 hardware_delay_bytes,
-                        double volume) = 0;
+    // TODO(henrika): should be pure virtual when old OnData() is phased out.
+    virtual void OnData(AudioInputStream* stream,
+                        const AudioBus* source,
+                        uint32 hardware_delay_bytes,
+                        double volume) {};
+
+    // TODO(henrika): don't use; to be removed.
+    virtual void OnData(AudioInputStream* stream,
+                        const uint8* src,
+                        uint32 size,
+                        uint32 hardware_delay_bytes,
+                        double volume) {};
 
     // There was an error while recording audio. The audio sink cannot be
     // destroyed yet. No direct action needed by the AudioInputStream, but it
     // is a good place to stop accumulating sound data since is is likely that
     // recording will not continue.
     virtual void OnError(AudioInputStream* stream) = 0;
 
    protected:
     virtual ~AudioInputCallback() {}
   };
@@ skipping 30 matching lines @@
   // Sets the Automatic Gain Control (AGC) state.
   virtual void SetAutomaticGainControl(bool enabled) = 0;
 
   // Returns the Automatic Gain Control (AGC) state.
   virtual bool GetAutomaticGainControl() = 0;
 };
 
 }  // namespace media
 
 #endif  // MEDIA_AUDIO_AUDIO_IO_H_